Type-writing machine.



PATENTED SEPT. 17, 1907 G. HQSMITH TYPE WRITING MACHINE. APPLICATION FILED 31 11.26, 1908.

3 SHEETS-SHEET 1.

INVENTDR WWW MTNE55E5= No. 866.606-. PATENTED SEPT. 17, 1907. I

- (2.5. SMITH.

TYPE WRITING MACHINE. AP'PL'IogrIoN rum JAN. 26, pee.

s SHEETS-SHEET 2.

WWZ H TTURNEY' TYPETWRITING MAGHINE.

AP PL I'QATION FILED JAN. 26, 190p.

3 SHEETS-SHEET E INVENTEIFL UNITED STATES PATENT OFFICE.

GEORGE II. SMITH, OF FOREST HILL, NEW JERSEY, ASSIGNOR TO UNION TYPEWRITER COMPANY, OF JERSEY CITY, NEW JERSEY, A CORPORATION OF NEW. JERSEY.

,TYPE-WRITING MACHINE.

Specification of Letters Patent.

Patented Sept. 17, 1907.

Original application filed August 27, 1900, Serial No. 28,142. Divided and this application filed January 26, 1906.

Serial No. 297,962.

I To all whom it may concern:

Be it known that I, Gnonon II. SMrrn, a citizen of the United States, and a resident of Forest Hill, in the county of Essex and State of New Jersey, have invented certain new and useful Improvements in Type-Writing Machines, of which the following is a specification.

My invention relates to typewriting machines and has for its object to provide an improved platen shift for such machines.

My invention consists in certain features of construction amlcombinations and arrangements of parts, all of which will be hereinafter described and particularly pointed out in the claims.

This application is a division of my application for Letters Patent for typewriters, Serial No. 28,142, filed August 27, I900.

111 the accompanying drawings, Figure 1 is a fragmentary top plan view of as much of a typewriting machine as is neccssary to illustrate my inwntion. Fig. 2 is a front elevation of the machine with parts omitted.

Fig. 3 is a vertical section substantially on the line ;r1r

ofFig. 2 and looking toward the left. Fig. 4 is-a view in i m pp etive of a detail of the shifting mechanism.

in tlieil1'a\vi1igs, A designates the. main. frame, which has a top plate A. From said top plate rise suitable posts A'-' and Af, which support the rear guide rail A* and the front guiderail A" respectively, on which guide rails the carriage mi ivcs from side to side in the usual way. ln such motion the carriage may be actuated by the usual spring 1neclranisrhland controlled by the usual or any suitable eseapcmentingchanism; but as these parts are well known and form r1 part of the present invention, tlicy have/not been shown herein.

The carriage comprises a substantially rectangular frame B provided with a pair of tra-verse n)llcrs-13 to run on the back rail A, and a single front rpllcr B to run on the front rail AP. In the side bars of thegarriage frame are depressions B to allow for the vertical mo ven'rent of the shaft D of the platen I) as the same is shifted for upper and lower case printing. The shaft D of the platen is mounted in bearings formed in a platen frame F), havinglongitudinal connecting bars E at the rear (Fig. l)and l9" at the bottom (F ig. 2). This platen frame is pivotally connected. at the lower portion thereof to crank arms F as indicziited at F", said crank arms being secured to a rock shaft F journaled in the carriage, whereas the upper portion of said platen frame is piv oted at each side, as indicated at F, to one end of a vlink F, the opposite end of which is pivoted at l3 to the carriage. The links F and crank'arms F constitute in effect, parallel links on which the platen frame and platen receive vertical movements to change the printing pos ition. 'lhe shifting mechanism comprises a rock shaft G pivoted in lugs G rising from the top I plate A of the machine. Arms G, projecting from the rock shaft G, are connected at their outer ends to a supporting or shift rail G which supports aroller E mounted in the lower longitudinal barwE of the platen frame. A bracket E depending from said bar E has a lug or rearwardly bent end F, projecting beneath the rail G to prevent the roller E from being raised off of the rail G by violent shifting of the platen or in any other manner.

The rock shaft G has connected to one end thereof, a crank arm G which is connectcd'by a link G with an arm G that projects from one end of a rock shaft G that is pivoted in lugs Gr rising from a portion of the main frame A at the front thereof. This rock shaft G has secured thereto at its opposite end, a hand operated actu-' ating arm G provided with a shift key G at the keyboard of the machine (see Fig. 2). It will be seen that if the shift 'key G be depressed, the platen frame and platenwill be elevated, and on the release of the key, the platen and platen frame will move to their normal positions by their own weight. A

The weight of the platen and platen frame is partially taken up by coiled springs F which surroundthe rock shaft 1. Each of the springs F is connected atone end to a collar F on the shaft F and at the other end to a bracket F projecting from the carriage frame and encircling the shaft F". Each of the crank arms F is fixed on the shaft F between the carriage and the encircling portion of one of the brackets F. The upward movement of the rail G is limited by an arm G", which projects downwardly and then forwardly from one of the center crank arms G, abutting against an adjusting screw G; whereas the downward movement of the platen and its frame is limited by adjustable screws E threaded through lugs 13 projecting from the carriage frame B, and with which forwardly projecting arms E on the platen frame cooperate.

I have provided means whereby the platen fraine may be held in its upper case position if desired. An

is fixedly secured. In t 0 present instance the arm G is formed as a part of the crank arm G Near the upper arm G projects upwardly from the shaft G to which it end of the arm (1 a threearmed lever H is pivoted at lug II" which is connected by a spring H to a stud H projecting from the frame post A The third arm of the three -armed lever projects forwardly and is in position to be conveniently manipulated. When the parts tlon of scan-loge, a vertically movallls platen frame carry is such that if the forwardly projecting ar'm of the lever be raised until the stud H passes the dead center or the pivotal center H of the three-armed lever, then the spring H will prcss'the lug H against; the crank arm 3t" and press said crank arm towards the front of the machine, this moving the platen frame to upper case position and holding it in such position. -It will be seen that the spring H is adapted to hold the three-armed lever H in either of the two positions which it is adapted to occupy.

What l'clai'rn as new and desire to secure by Letters Patent, is:--

1. In a front-strike typewriting machine, the combinaing a platen, a vertically movable shiforail located beneath the platen, means for eifecting a vertical movement of said shiftrail, a rock-shaft carried by said carriage, crank arms carried by the rock-shaft and connected to .said platen frame, a. counter-balancing spring connected to verse to the length thereof for upper and lower case \vriting,a spring-pressed stop that is shiftablo to two positions and is adapted to be maintained by its springin either of the two positions to which it may be moved and, which is independent of the said shifting means, the relation between the stop and the shifting means being such that. in one position of the stop itwill cooperate with the shifting means to retain the platen in the shifted position, whereas in the other position the said stop is carried out of co operative relation with the shifting means.

3. ]n a front-strike typewriting machine, the C(Jlllllillii tion of a carriage, a vertically movable shift rail located beneath the platen and which supports and shifts the platen of said carriage verticallyjshitting means opcratively connected to the shift rail, and a spring-pressed hand operated pivoted lever shiftable to two positions and which when in one position, cooperates with the shifting means to maintain the platen in a shifted position, but

when in the other-position does not affect said shifting" means, the spring of said lever being effective to exert a force upon one or the other side of the pivotal center of said lever according as said lever is in one or the ollicr of its positions.

4. In a front-strike typewritlng machine, the combina tlon of a carriage, a vertically movable shift rail which vthe other side of the pivotal center of said lever.

5. In a fron strike typewriting machine, the combination of a carr ice, .1 hand-operated spring pressed lever pivoted to a fixed portion of the machine and which constitutes a stop to maintain the platen in the shifted position. the spring of which lever is adapted to exert its force upon one or the other side of the pivot of said lever in accordam'c with the position of the lever, a vertically movable shift. rail upon which the platen is supported and intermediate operative connections between said shift rail and said lever.

(i. in a front-Strike typewriting machine, .tl e combination of a carriage, a hand operator] spring pr ed pivoted lever, the spring of wlriclnis adapted to-ex'ert its force upon one or the other 'de of the pivot oi the lever in accordance with the position of said lover, a vertically movable shift rail upon which the platen is supported, intermediate operative connections between said shift. our and said lever for moving-.and maintainingithe platen in the shifted position, and a shift key opcratiyely connected to the shift rail and independent of said lever for temporarily shift the platen 'and permitting it to resume its normal position when pressure upon said shift key has been released,

7. in a front-strike writing machine, the combination of a carriage, a hand-operated spring pressed pivoted lever, the sprint: of which is adapted to exert its force upon one or the other side of the pivot of said lever in accordance with the position of said lever, a vertically movable shift rail upon which the platen is supported, arock shaft: which is opcratively connected to said shift rail, anarl'n extendin; from said shaft and which is disconnected from but is adapted to cooperate with said lever. and 'aftinger key for operating said \rock shaft, whereby-lire railcand platen may be shifted andmaintained in the shifted position by. i'

the said lover or may be temporarily slrif tcd by tlie finger key and allowed to us ume tl rc normal position when pressure is released from said key. i

8. The combination of a shii'table platen, a cuse shift key'for moving; saidplaionto shifted positlonfand spring means normally out pf operative connection with said platen but adapted to be brought into operation to move said platen to shifted position.

5). The combination of a shiftable platen normally hold by gravity in loner case position, .i key for moving said platen to upper case position, and spring means normally out of operative connection with said platen but adapted.

of said lover being disconnected from but adapted in one position of the lover to'coiiperaie with said 'crank ar d and to be moved out; of cooperation withfsaidcrnnk arm in another position of another arm of, said lever carrying a finger pi connected to the third ar'm'of s. lcvcr :indadaptci'i to be shifted to either side oi the iplVotab-centbr of said lever.

Signed at the borough of liianhattanjcity oi-New York,

in the county of New York, and State of New York, this.

25th day of January, A. I). 1006. GEORGE Ii. Siii'lll.

Witnesses I l. lll. Worms, M. i HANNWEBEB.

- the lever, and a spring 1 

